Manhole frame and cover.



No. 638,574. Patented Dec. 5, I899.

T. P. GREGEB. MANHOLE FRAME AND COVER.

(Application filed Apr. 25, 1899.) (No Model.) 2 Sheets-Sheet 1.

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No. 638,574. Patented Dec. 5, I899. T. P. GREGER.

MANHOLE FRAME AND COVER.

(Application filed. Apr. 25, 1899.) (No Model.) 2 Sheets-Sheet '2.

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THOMAS P. GREGER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO GREGERMANUFACTURING COMPANY, OF CAMDEN, NEl/V JERSEY;

MANHOLE FRAME AND COVER.

SPECIFICATION forming part of Letters Patent No. 638,574, dated December5, 1899.

App filed April 25, 1899. Serial No, 714,376. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS P. GREGER, a citizen of the United States,residing at the city of Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented certain new and useful Improvementsin Manhole Frames and Covers, of which the following is a specification.

My invention has relation to a frame and cover for a manhole, and insuch connection it relates particularly to the construction andarrangement of the same. 7

The principal object of my invention is to provide a frame and cover formanholes, such as are provided for sewers, electric conduits, vaults, orthe like, the frame and cover being of simple construction and adaptedto efiiciently seal the manhole against unwarranted entrance ortampering with that which is located beneath the manholeframe withoutdestroying the sealing means of the appliance and also to preventleakage of water into or the escape of gases from the manhole.

My invention, stated in general terms, consists of a manhole frame andcover constructed and arranged in substantially the manner hereinafterdescribed and claimed.

The nature and scope of my invention will be more fully understood fromthe following description, taken in connection with the accompanyingdrawings, forming part hereof, in which Figure 1 is a top or plan viewof a manhole frame and cover embodying main features of my invention,portions thereof being broken away to more clearly illustrate theconstruction and arrangement of the same. Fig. 2 is a vertical sectionalview of Fig. 1. Fig. 3 is a perspective view of the device for lockingthe inner cover-plate of the concrete or asphalt filled manhole-coverdown upon its seat. Fig. 4 is a front elevational view of thebayonet-slot formed in the manhole-frame and adapted to receive one endof the locking-bar illustrated in Fig. 8; and Fig. 5 is across-sectional View of the concrete or asphalt filled manhole-topcover, taken on the line 00 a: of Fig.1.

Referring to the drawings, a represents the base of the manhole-frame,having the central opening ct surrounded by an upwardlycurved rim a Fromthe base a extends the circular wall I), having at its upper edge or rima seat I) for the reception of the upper or exterior concrete or asphaltmaterial filled cover d of the appliance. The wall I) is reinforced by aseries of triangular ribs b extending from the base a to approximatelythe upper edge of the wall. Between the rim a and the wall Z) is formedan annular channel e, and from this channel 6 at appropriate points ofthe frame extend the openings 6, leading to the exterior of the frame.The exterior cover dis adapted to be filled with concrete, asphalt,granolithic, or similar material, as hereinbefore explained. The curvedrim a forms a seat for the inner cover-plate f, which has on its undersurface a rubber gasket f, fitting down upon the rim a The under surfaceof the cover-platef is also provided with an annular rib f closelyfitting the central opening formed by the rim a Upon the upper surfaceof the cover-plate f are formed ears f in which are pivoted theliftingrings f*. The inner cover-plate f is also provided on its uppersurface with a central log or projection f having a central recess ordepression f into which the end of ascrew-bolt g is adapted to enter,for a purpose to be presently explained.

In the wall b of the frame is provided a bayonet-slot 6 as illustratedin Figs. 2 and 4, and diametrically opposite the slot is provided arecess b, as illustrated in Fig. 2. iVhen the upper or exterior filledcover 01 is removed from its seat, a locking-bar h is adapted to beinserted into the interior of the frame in the following manner: One endof the bar his first inserted into the recess b and the other end isthen slid into the bayo- 9o net-slot b and the bar locked in itslowermost position. The bar h, midway of its length, is provided with ascrew-bolt g, which when advanced is adapted to hear at its point uponthe projection f of the cover-plate f 5 to thereby tightly clamp thecover f upon its seat. The bolt g has a square head g, over which isadapted to be fitted a saddle or block g to prevent the bolt from beingturned. The block g when in position, is locked to the bar h by means ofa padlock g the staple g of which passes through a suitable apertureprovided in the head g of the bolt, and thus to effectuallypreventunwarranted access beneath the manhole unless the lock is brokenor removed. The upper or exterior filled cover d has its periphery oredge out out, as at cl and d, and the semicircular openings thus formedlead into the recesses d provided in the edge of the said cover, asclearlyillustrated in Fig. 5 of the drawings.

Having thus described the nature and object of my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. In a manhole frame and cover, a base having a central openingsurrounded by an upwardly-curved rim, a Wall projecting up ward fromsaid base and having a seat formed on its upper edge, an outer coveradapted to engage the seat of said wall, an inner coverplate adapted torest upon the curved rim of the base of said frame and a locking devicefor the inner cover-plate consisting of a locking-bar, a'bayonet-slotand recess formed in the interior wall of said frame and in which theends of said bar are adapted to be guided and held, a bolt traversingsaid bar and adapted to clamp the inner cover-plate down upon the curvedrim of the base of said frame, and means for locking said bolt againstturning, substantially as and for the purposes described.

2. In a manhole frame and cover, a base having a central openingsurrounded by an 0 plate adapted to rest upon the curved rim of 35 thebase of said frame and a locking device for the inner cover-plateconsisting of a locking-bar, a bayonet-slot and recess formed in theinterior wall of said frame and in which the ends of said bar areadapted to be guided and held, a bolt provided with a squareshapedperforated upper end traversing said bar and adapted to clamp the innercoverplate down upon the curved rim of the base of said frame, a saddleor block spanning said bar and square portion of said bolt and lockingmeans engaging the perforation of said bolt and preventing turningthereof while spanned by said saddle or block, substantially as and forthe purposes described.

In testimony whereof I have hereunto set my signature in the presence oftwo subscribing witnesses.

THOMAS P. GREGER.

Witnesses:

J. WALTER DOUGLASS, THOMAS M. SMITH.

